"I don't know all the facts," he said, "as far as I'm concerned, he was unarmed. Supposedly something had happened before the incident, but even if what had happened before the incident was true, it's still no reason to be shot."

NAACP Oklahoma President Anthony Douglas asked the crowd to put their hands up in the air and yell "don't shoot!"

After they did that three times, he said "you still got shot."

Other speakers urged the crowd to voice their outrage at the ballot box.

In 2013, 17 people were fatally shot by Oklahoma police officers, according to the Oklahoma State Bureau of Investigation.

Eight of them were white.

Four were black.

"I would just say none of us know what really happened in Ferguson," John George, President of the OKC Fraternal Order of Police Lodge 123, said.

He said more evidence is coming to light that shows Officer Wilson was attacked - suffering a fracture to his eye socket in a scuffle with Brown.

"If that's accurate, then that's more of the mind of the suspect," George said. "You're not going to take me into custody and I'm not going to let you do it, at all cost."